<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../4-throttle.js"></script>
  <style>
    body{
      height:2000px;
      background:linear-gradient(#125,#eae)
    }
  </style>
</head>
<body>
  <script>
    //绑定滚动事件
    // window.addEventListener('scroll',function(){
    //   console.log(Date.now());
    // })

    window.addEventListener('scroll',throttle(function(){
      console.log(Date.now());
    },500))
  </script>
</body>
</html>